Steve Palazallo and Sam Monson (both guys used to be with PFF) did a detailed analysis of each division's draft. It's rock solid on available on youtube. Their analysis of this pick was really informative. First, they pointed out that when draftniks were looking at Faulk, Crawford was the one jumping out on tape. And it's true- he's faster, twitchier and gets in backfield like a blur. And his pressure stats were significantly better. He had a solid senior bowl as well.
The Raiders knew they were trading Wilson (who Tonka can replace), and Koonce is here for one more year. This kid may need some seasoning but the tools are there.